Vibratory Creep Feed Grinding

蠕变进给磨削时，切削最大晶粒深度变小，有效刃上的切削力变小。然后在砂轮工作面经常发生加载和掠磨。由于接触弧长，磨削点温度随切削力的增大而升高。因此，热损伤，如烧伤痕迹，经常在工件上。为了防止烧蚀痕迹的形成，本文提出了振动蠕变进给磨削。工件被迫沿工作台进给方向振动，即频率为30Hz，幅值2A为0.32 ~ 1.5mm。为了明确振动蠕变进给磨削的有效性，对其磨削性能进行了实验研究。主要研究结果如下：(1)振动蠕变进给磨削的磨削功率比常规蠕变进给磨削小。(2)振动蠕变进给磨削，在砂轮深度为3mm、工作台速度为0.179mm/s的情况下，对SKH4和SUS304进行下切磨削时，能有效防止烧痕的产生。然而，振动蠕变进给磨削的砂轮磨损比常规蠕变进给磨削大。(3)在SKH4的振动蠕变进给磨削中，在振幅2A为1.0mm或1.5mm的情况下，均可防止烧痕。采用WA磨料砂轮对SHK4进行振动蠕变进给磨削时，径向砂轮磨损比常规蠕变进给磨削时减小。(4)下切振动蠕变进给磨削时，提供给砂轮-工件接触区域的磨削液比常规蠕变进给磨削时多。而在上切振动蠕变进给磨削中，供磨液量不增加。(5)在振动蠕变进给磨削中，在相同的金属去除率下，径向砂轮磨损量和垂直磨削力随砂轮切削深度的增加而增加。少

In creep feed grinding, the maximum grain depth of cut becomes smaller, and so the cutting force on an effective edge becomes smaller. Then the loading and grazing often occurs on the working face of the grinding wheel. Because of a long arc of contact, the temperature at the grinding point rises with the increase of cutting force. Consequently thermal damage such as a burn mark is often made on a workpiece. In order to prevent the formation of the burn mark, vibratory creep feed grinding is proposed in this study. The workpiece was forced to vibrate in the table feed direction, that is to say, the frequency fis 30Hz and amplitude 2A is from 0.32 to 1.5mm. In order to clarify the effectiveness of the vibratory creep feed grinding, the grinding performance are experimentally investigated. The main results obtained are as follows : (1) The grinding power in the vibratory creep feed grinding becomes smaller than that in the conventional creep feed grinding. (2) Vibratory creep feed grindi … More ng is effective for the prevention of the burn mark in case of down-cut grinding of SKH4 and SUS304 under the wheel depth of cut 3mm and the table speed 0.179mm/s. However, the wheel wear in vibratory creep feed grinding becomes larger than that in the conventional creep feed grinding. (3) In the vibratory creep feed grinding of SKH4, the burn mark was prevented under the amplitude 2A of 1.0mm or 1.5mm. Moreover the radial wheel wear in the vibratory creep feed grinding of SHK4 with WA abrasive grinding wheel becomes smaller than that in the conventional creep feed grinding, (4) In down-cut vibratory creep feed grinding, more grinding fluid is supplied to the wheel-workpiece contact area than in the conventional creep feed grinding. However, in up-cut vibratory creep feed grinding, the amount of grinding fluid supplied does not increase. (5) In vibratory creep feed grinding, both radial wheel wear and vertical grinding force increase with the increase of the wheel depth of cut under the same metal removal rate. Less